Apple Inc. has reported the following financial information for its Services segment for the fiscal year ending September 30, Year 2.

Income Statement for Year Ended September 30, Year 2

• Revenue: $200,000
• Cost of services: $120,000
• Gross profit: $80,000
• Operating expenses: $30,000
• Research and development expenses: $15,000
• Depreciation expense: $5,000
• Operating income: $30,000
• Other income: $10,000
• Net income: $28,000

Balance Sheet as of September 30, Year 2 Assets

• Cash: $40,000
• Accounts receivable: $60,000
• Inventory: $30,000
• Property and equipment (net): $90,000
• Other assets: $20,000
• Total assets: $240,000

Liabilities

• Accounts payable: $20,000
• Short-term debt: $10,000
• Long-term liabilities: $50,000
• Stockholders' equity: $160,000
• Total liabilities and stockholders' equity: $240,000

Required:

1. Calculate the gross profit margin.
2. Determine the operating profit margin.
3. Compute the return on assets (ROA).
4. Find the current ratio.
5. Calculate the debt to equity ratio.